Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fe642e5f9317c1…

MALICIOUS

PDF

93.9 KB Created: 2021-07-07 03:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 38b8c945ccc69885d8080a988c38258e SHA-1: c5bbcfb0db04564d40a87c7f816678b50f70e16c SHA-256: 29fe642e5f9317c131079bea90ba2edf2ce003d62bb33f4b0d94b39a35d1b7f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF itself contains garbled content, likely due to obfuscation or the nature of its generation by wkhtmltopdf, but the primary threat stems from the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b9ae821db1577e2659ff077e4a88fae6/sataziwek.pdf In PDF document text
    • http://lapenya.cat/imgjovesnaves/file/mawadipikuroxal.pdfIn PDF document text
    • http://dhf-china.com/d/files/62576984745.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070311f06e0a---bunir.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r0idibj6266va1kjpn4u36dg0t/tewama.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/hej01ms44qvlqtg988vocj7lop/66190968925.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/37554966773.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/fasixekifufimulokalog.pdfIn PDF document text
    • http://minerva-collection.net/files/files/xuriselinupixuweti.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/12525027435.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cf2b90cd465bdbf425d421f59128212c/36241875983.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/79366692548.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/pimazarinuz.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f0677a4d153593ad8708110878e6d18e/mesugunupafegewukusa.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90dd4cfb1---bimuvevopetijem.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e8592cf4824ce8e3534b7513da205579/xikepugejo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4530a41aea7e9155acb5e78b07c628bb/15930881321.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/31898644121.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9607g9cp63793pfp9eh4fi8i67/meverifok.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/56fe5e15f9d068f256d142deb00064d4/35880561284.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/20412885293.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/4952968510.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/lemefatuxitiliwexu.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60b8bdf81bda4.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210521203309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+pdf+books+for+middle+schoolPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 16760 bytes
SHA-256: 2ce50eeea08cd4cc64912b5e8bf8cddf9c1a648ae182a9976aab0a476f6a4fb2
font_01_sfnt_off000139dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F3 10728 bytes
SHA-256: ed8a330eb6c0ef5cb0db9ff1cdcfee84ba2306beab678f37ca44869d72b23626

Open this report in the interactive analyzer, or submit your own file for analysis.